Fixed isseus with latest version

Author: Maijenburg, Goopher

build.gradle

@@ -5,6 +5,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:4.1.0'
+        classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
     }
 }
 

library/build.gradle

@@ -1,4 +1,9 @@
 apply plugin: 'com.android.library'
+apply plugin: 'com.github.dcendents.android-maven'
+
+ext {
+    publishedGroupId='com.github.Goopher'
+}
 
 android {
     compileSdkVersion 30
@@ -17,4 +22,4 @@ android {
 dependencies {
     implementation 'com.google.android.play:core:1.8.2'
     implementation 'com.google.android.play:core-ktx:1.8.1'
-}
+}

sample/src/main/java/hotchemi/android/rate/sample/MainActivity.java

@@ -23,6 +23,7 @@ protected void onCreate(Bundle savedInstanceState) {
                 .setShowLaterButton(true) // default true.
                 .setDebug(true) // default false.
                 .setCancelable(false) // default false.
+                .useInAppReviewSystem(true) // default false
                 .setOnClickButtonListener(new OnClickButtonListener() { // callback listener.
                     @Override
                     public void onClickButton(int which) {